- Tags: JS DOM, JS DOM NodeList
- Categories: JavaScript Methods, JavaScript Reference, Reference
Quick Reference
The NodeList forEach() method executes a callback function for each node in a NodeList, which is an array-like list of Node Objects.
<!-- html element to place output -->
<p id="my_output"></p>
// variables
let my_list = document.body.childNodes;
let my_text = '';
// loop through nodes
my_list.forEach(
function(node, index) {
my_text += index + ' ' + node + '<br>';
}
);
// output to the HTML element
document.getElementById('my_output').innerHTML = my_text;
Output
0 [object Text]
1 [object Comment]
2 [object Text]
3 [object HTMLParagraphElement]
Syntax
nodelist.forEach(function(currentValue, index, arr), thisValue)
Parameters
| Parameter | Return Types |
|---|---|
| function | A function to run for each node (required) |
| currentValue | The value of the current node (required) |
| index | The index of the current node |
| arr | The NodeList of the current node |
| thisValue | A value passed to the function as its "this" value (default is undefined) |
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JAVASCRIPT NOTES:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
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